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AP Chem Unit 3 Exam Flashcards | StudBud
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AP Chem Unit 3 Exam
AP Chem Unit 3 Exam
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An #APChem review of Chapters 1-10, featuring #bonding, #moleculargeometry and #idealgaslaw.
Flashcards
27 cards
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Practice quiz
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Questions
27
Answers
1
Real and ideal gases behavior similarly at
low pressure, high temperature
high pressure, high temperature
low pressure, low temperature
high pressure, low temperature
2
Which compound will have a higher boiling point and why?
neither; same molar mass
2-methylpropane; it's a more symmetrical structure
2-methylpropane; less surface area for intermolecular forces
butane; more surface area for intermolecular attractions
3
Which geometry has the least steric strain? Assume carbon as the central atom.
tetrahedral
trigonal planar
trigonal bipyramidal
octahedral
4
In the formation of aluminum sulfate, how many electrons are transferred in total?
6
12
3
2
5
Which carbon would be considered the most stable position to attach a chlorine?
2nd from the right
2nd from the left
top
1st on the bottom left
6
Which compound has the strongest ionic character?
HBr
MgF2
BeCl2
KI
7
As a gas loses ideal behavior, which parameter will be most affected by intermolecular forces?
V; the cloud contracts, decreasing volume
n; rxns start and increase/decrease moles
P; molecules attract and relieve pressure
T; as molecules are pulled closer, temperature increases
8
As summer heat of 38
o
C, what pressure do your 35 psi car tires pumped at 15
o
C increase to?
32 psi
33 psi
37 psi
38 psi
9
Which compound will form a precipitate?
CaI2
HgNO3
K2CrO4
AgBr
10
Which of these compounds would water be capable of hydrogen bonding?
NaCl
NH3
CH4
BH3
11
Which compound is an exception to the octet rule?
BrI
BH3
SO3
C2H2
12
What hybridization is represented on the central atom?
sp2
sp3d
sp
sp3
13
What is the oxidation number of nitrogen in ammonium nitrate?
-5
-3
+3
+5
14
Hydrogen peroxide, H
2
O
2
, is composed of what bond angles?
109.5
120
180
105
15
2 mol O
2
and 1 mol He are in a pressure vessel at 300 kPa. What is the partial pressure of O
2
?
300 kPa
100 kPa
200 kPa
900 kPa
16
946 mL of gas at 726 mmHg is compressed to 154 mL. What is the new pressure?
200.7 mmHg
4459.7 mmHg
4460 torr
118.2 mmHg
17
A gas mix contains 0.2 bar H
2
, 0.2 bar N
2
and 0.6 bar O
2
. What is its empirical formula?
H2N2O2
HNO
H2N2O6
HNO3
18
This compound has an oxygen that wants to be bent but is forced into a different angle.
OCl4
SOCl2
CH3OCH3
BeO
19
Cyclopropane is very unstable because of angle strain--how many degrees is it off the ideal?
19.5
49.5
30
17
20
At 1 atm, what volume will 1 mol of O
2
at 0
o
C occupy? (gas constant = 0.082)
22.4 L
0.082 L
716.7 L
O L
21
This molecular shape houses six bonding domains with no lone pairs.
seesaw
T-shaped
octahedral
trigonal bipyramidal
22
You could describe this molecule as _______________ polar.
weakly
strongly
non
moderately
23
STP!?!
101.3 kPa, O K
1 atm, OoC
750 torr, 273.15 K
1 bar, OoC
24
Which of these formulas (not the one pictured) have resonance structures?
CO
O3
C3H6
CO2
25
3 gases mix into a 3 L box, each with 1 mol from a 1 L box. Po of ea. = 2 bar, P of mix= ?
2 bar
1 bar
6 bar
3 bar
26
As the temp rises from 100
o
C to 200
o
C, a 0.76 L balloon expands to
0.38 L
0.5 L
1.52 L
1.0 L
27
Which molecular formula is invalid?
C3H5
C6H14
C5H10
CH3NH2
